Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
massiv » massive
massiveren » massiveeren, massigeren, passivieren, massiven, massivern, massivelyn
massivement » massiveement
massivere » massiveere, massiver, massive, massively
passieren » passiert, passiven

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((passiv OR massiv) OR (passieren OR ((massiveren OR massivement) OR massivere))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or massiv) or (passieren or ((massiveren OR massivement) or massivere)))".
• Adding a wildcard symbol may retrieve word variants: ((passiv or massiv) or (passieren or ((massiveren OR massivement) or massivere)))*.